Advancements in accuracy of the alanine dosimetry system. Part 2. The influence of the irradiation temperature |
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| Institution: | 1. ATILIM University, Faculty of Engineering, Department of Mechanical Engineering, 06836 İncek, Gölbaşı, Ankara, Turkey;2. Directorate of Nuclear Power Engineering-Reactor (DNPER), Nuclear Measurement Division, P.O. Box 3140, Islamabad, Pakistan;1. Department of Physics, R. T. M. Nagpur University, Nagpur, India;2. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, India;3. Health Physics Department, Inter University Accelerator Centre, New Delhi 110067, India;1. International Atomic Energy Agency (IAEA), P.O. Box 100, 1400 Vienna, Austria;2. Bundesamt für Eich- und Vermessungswesen (BEV), Dosimetrielabor im Forschungszentrum Seibersdof, Austria;3. Greek Atomic Energy Commission (IRCL/GAEC-EIM), P.O. Box 60092, Agia Paraskevi, 15310 Attiki, Greece;4. IBA Dosimetry GmbH, Dosimetry Laboratory, Bahnhofstrasse 5, D-90592 Schwarzenbruck, Germany;5. National Metrology Institute of South Africa (NMISA), Private Bag X34, Lynnwood Ridge, Pretoria 0040, South Africa;6. Radiation and Nuclear Safety Authority (STUK), Laippatie 4, FI.00881 Helsinki, Finland;7. Instituto Superior Técnico, LPRS – Laboratório, Metrologia de Radiações Ionizantes (LMRI), Estrada Nacional 10, 2695-066 Bobadela LRS, Portugal;8. Czech Metrology Institute (CMI) Radiova 1, CZ 10200 Prague, Czech Republic;9. Swedish Radiation Safety Authority (SSM), Solna strandväg 96, SE-171 16 Stockholm, Sweden;10. Jozef Stefan Institute (IJS), Ljubljana, Jamova 39, SI-1000, Slovenia;11. King Faisal Specialist Hospital and Research Centre (KFSHRC), P.O. Box 3354, Riyadh 11211, Saudi Arabia;12. Radiation Control Department, Ministry of Health, Sheba Medical Center, Aharon Katsir Av. #7, Ramat-Gan, Israel;1. CEA, DEN, DER, Laboratoire de Dosimétrie, Capteurs et Instrumentation (LDCI), Cadarache, 13108 Saint Paul-lez-Durance, France;2. CEA, LIST, Laboratoire National Henri Becquerel (LNE-LNHB), CEA-Saclay, Bât 602, C 111, 91191 Gif-sur-Yvette CEDEX, France;3. CEA, DEN, DEC, Laboratoire d′Analyses Radiochimiques et Chimiques, Cadarache 13108 Saint Paul-lez-Durance, France |
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| Abstract: | Systematic measurements of the temperature coefficient for alanine electron paramagnetic resonance (EPR) response have been performed for irradiation in the temperature range (10–50)°C and in the absorbed dose range (1–100) kGy at the dose rate 9.5 kGy/h. During the 60Co -ray irradiation, -l-alanine dosimeters were kept in a sealed aluminum holder that provided an effective heat exchange with the temperature-controlled environment. The time between the irradiation and signal measurements was standardized, and a reference sample fixed in the resonant cavity was used to correct the signals for small variations in the spectrometer sensitivity. The temperature coefficient for each dose was determined from approximately 30 experimental points processed by the weighted least-squares technique after the necessary statistical tests were done. The temperature coefficients thus determined were considerably lower than previously reported. The dose dependence of the temperature coefficient features a minimum at (20–30) kGy (about 0.135%/K) with higher values at 1 kGy (0.17%/K) and at 100 kGy ((0.175–0.19) %/K). With the exception of very high doses, no significant distinction was found between the temperature coefficients of Bruker and NIST dosimeters, which differ in shape and binder content. |
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